xperia p rooting error !

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http://forum.xda-developers.com – hey, i have xperia p with build number 6.1.1.B.1.54 ICS .. and i followed this method http://forum.xda-developers.com/show....php?t=2107775 to root my phone .. after i connected my phone to flashtool and tried to flash a different build number .. it says DEVICE DISCONNECTED .. now the phone won't turn on! i tried to flash another zip with my same old build number .. same thing happened .. what is the prob ? plz help me ... thnks (HowTos)